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      04-17-2009, 12:59 PM   #1
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Which Exhaust Setup Gives You The Most Gains?

I dont care about the money. and im not worried about emissions. i also dont really want the check engine light coming on either. I wanna go catless and want a system from the end of the headers all the way back. which setup will give me the most hp / tq gains???? thx in adv
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      04-17-2009, 01:42 PM   #2
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I would say AA catless x pipe, their software, and their exhaust. They are one of the few that have dynos for their exhaust alone. I want to say it was about a 14hp increase for just the catback. Regardless of what brand x pipe/mid pipe setup you get if you delete the primary cats your going to have to get the car tuned in order to avoid not having a check engine light.
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      04-17-2009, 01:47 PM   #3
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Excellent choice, AA. Pricey but good.

Fabspeeds dynos are just as good btw. 15hp for their Xpipe. Priced at $625 as well.

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I would say AA catless x pipe, their software, and their exhaust. They are one of the few that have dynos for their exhaust alone. I want to say it was about a 14hp increase for just the catback. Regardless of what brand x pipe/mid pipe setup you get if you delete the primary cats your going to have to get the car tuned in order to avoid not having a check engine light.
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      04-17-2009, 02:05 PM   #4
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rpi gt exhaust 28hp legit
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      04-17-2009, 02:16 PM   #5
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Quote:
Originally Posted by dmerk1978 View Post
rpi gt exhaust 28hp legit
with out cats or with cats?
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      04-17-2009, 02:19 PM   #6
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Quote:
Originally Posted by camaross305 View Post
I would say AA catless x pipe, their software, and their exhaust. They are one of the few that have dynos for their exhaust alone. I want to say it was about a 14hp increase for just the catback. Regardless of what brand x pipe/mid pipe setup you get if you delete the primary cats your going to have to get the car tuned in order to avoid not having a check engine light.

Akrapovic TI evolution system!
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      04-17-2009, 02:20 PM   #7
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whats the hp gains on the Akrapovic TI evolution system?
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      04-17-2009, 02:44 PM   #8
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Quote:
Originally Posted by d_dot View Post
whats the hp gains on the Akrapovic TI evolution system?
Here it comes:
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File Type: pdf Akrapovic M39X.pdf (375.8 KB, 126 views)
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      04-17-2009, 02:49 PM   #9
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That is beautiful!

But it requires a tune to prevent CEL.....

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Here it comes:
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      04-17-2009, 02:58 PM   #10
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Negative - it comes with Lambda adaptors!

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That is beautiful!

But it requires a tune to prevent CEL.....
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      04-17-2009, 03:10 PM   #11
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Quote:
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with out cats or with cats?
cat delete

http://www.m3post.com/forums/showthr...=236430&page=9
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      04-17-2009, 03:29 PM   #12
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if money is no object the aa and the Akrapovic systems are looking good on numbers. if money has to be budgeted the rpi system has to be on the top of the list.
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      04-17-2009, 04:03 PM   #13
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So you move the O2 past those rear cats?? And the 100 cell doesn't code?

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Negative - it comes with Lambda adaptors!
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      04-17-2009, 04:37 PM   #14
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Quote:
Originally Posted by naveenb View Post
if money is no object the aa and the Akrapovic systems are looking good on numbers. if money has to be budgeted the rpi system has to be on the top of the list.

the Akrapovic quotes 24hp, and the rpi quotes 28hp, so if the O.P. is looking for straight gains why wouldn't he go with the RPI system...am i missing something?
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      04-17-2009, 05:35 PM   #15
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Quote:
Originally Posted by Checkcaptain View Post
Akrapovic TI evolution system!
damn thats a sexy exhaust. sorry bout asking for the hp numbers i was at work earlier and the pics most of the time dont show up. i see i asked for the numbers like an idiot. but thx now where can i get one of them and if its 24hp do u kjnow how much it would be with no cats?
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      04-17-2009, 06:08 PM   #16
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another quick question if i get a cat delete x pipe from fab speed will it hook up directly to rpi cat back just curious since they are fairly local?
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      04-17-2009, 07:04 PM   #17
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Because a difference of 4hp measured on different dynos and different cars is insignificant. Plus the Akrapovic has cats and resonators. The RPI doesn't. Therefore, if we are to split hairs, the Akrapovic is clearly superior.

I stand by the comment that any well designed exhaust will net about the same gains. It is not rocket science.

Quote:
Originally Posted by dmerk1978 View Post
the Akrapovic quotes 24hp, and the rpi quotes 28hp, so if the O.P. is looking for straight gains why wouldn't he go with the RPI system...am i missing something?
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      04-17-2009, 08:06 PM   #18
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Quote:
Originally Posted by dogears View Post

I stand by the comment that any well designed exhaust will net about the same gains. It is not rocket science.
+1.. My feeling is the biggest changes in dyno numbers have to do with the person conducting the dyno runs.

Any properly designed system will have very little restriction and all offer about the same HP gain. The real trick is doing that plus coming up with a nice sound and no drone at the same time.
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      04-18-2009, 12:48 AM   #19
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The Akrapovic dyno graph looks 100% legit. All correction factors, run down losses etc are very consistent and it's a realistic gain.

Same goes with the Active Autowerke system, very realistic figures and again top quality.

As a package the Active Autowerke system in unbeatable with it's excellent and thoroughly tested software.
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      04-18-2009, 07:52 AM   #20
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The Akrapovic system is also made out of titanium which means its much lighter.

Quote:
Originally Posted by dogears View Post
Because a difference of 4hp measured on different dynos and different cars is insignificant. Plus the Akrapovic has cats and resonators. The RPI doesn't. Therefore, if we are to split hairs, the Akrapovic is clearly superior.

I stand by the comment that any well designed exhaust will net about the same gains. It is not rocket science.
Quote:
Originally Posted by dmerk1978 View Post
the Akrapovic quotes 24hp, and the rpi quotes 28hp, so if the O.P. is looking for straight gains why wouldn't he go with the RPI system...am i missing something?
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      04-18-2009, 10:04 AM   #21
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Quote:
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The Akrapovic system is also made out of titanium which means its much lighter.
Mine should be here tuesday.
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      04-18-2009, 12:35 PM   #22
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Quote:
Originally Posted by mikewads View Post
The Akrapovic system is also made out of titanium which means its much lighter.
is that the main difference between stainless steel and titanium the weight savings? or can one provide more hp gains some how?
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